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» Online Classroom   »   » Public Discussion of Cel Nav   » Relative azimuth

Author Topic: Relative azimuth

 - posted July 30, 2007 11:53 AM      Profile for rpadams           Edit/Delete Post 
I am currently taking the home study course in celestial navigation. Although I'm able to obtain the relative asimuth (Z), and know what to do with it, I'm having difficulty "picturing" this azimuth, i.e., what it is relative to; how it fits into the overall sight reduction excercise. As such, I would appreciate a more-detailed explanation (possibly a graphic) of this azmith to help me understand this particular, intermediate step. Thank you.

Robert Adams

David Burch

 - posted July 30, 2007 01:11 PM      Profile for David Burch           Edit/Delete Post 
Please check to see if the drawings below along with the discussion of Azimuth angle in Glossary might do the job.



thanks for bringing this up. i was surprised to note that we do not have a picture of the "celestial triangle" sometimes called "navigator's triangle" anywhere in the course materials. We usually draw it on the board once during the classroom course, but rarely any more than that. But we should have some reference and hopefully this will do the job till we get something better.

Note that Zn (Azimuth) is the true bearing 0 to 360 relative to North and Z (Azimuth angle) is the relative bearing 0 to 180 relative to north. the relationship between them depends on the value of LHA as explained in the notes, which may make more sense after looking at these pictures.

From: Starpath, Seattle, WA

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